Dynamic Fracture Toughness of Modified SA508C12 in the Ductile-to-Brittle Transition Region

Miglin, M.T.; Wade, CS; Joyce, JA; Sluys, WA Van Der

doi:10.1520/stp16860s

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…As illustrated in Figure 2, the finite strain and small strain calculations are in very close agreement beyond r/CTOD=2. These observations indicate that cleavage fracture initiation is unlikely within the zone where finite strain effects dominate due to loss of stress triaxiality, a conclusion supported by experimental observations [14][15]. Thus, the stress distribution defined by the SSY model using conventional small strain theory provides an appropriate reference solution to quantify size effects on crack-tip stress fields.…”

Section: Crack-tip Stresses In Infinite Bodiesmentioning

confidence: 53%

The influence of weld strength mismatch on crack-tip constraint in single edge notch bend specimens

Kirk

Dodds

1993

Int J Fract

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Interim: 1-1-91 to 1-1-92 14. Dodds and Anderson provide a framework to quantify finite size and crack depth effects on fracture toughness when failure occurs at deformation levels where 1 no longer uniquely describes the state of stresses and strains in the vicinity of the crack-tip. Size effects on cleavage fracture are quantified by defining a value termed lssy: the J to which an infinite body must be loaded to achieve the same stressed volume, and thereby the same likelihood of cleavage fracture, as in a finite body. In weld metal fracture toughness testing, mismatch between weld metal and baseplate strength can alter deformation patterns, which complicates size and crack depth effects on cleavage fracture toughness. However, the virtually limitless number of weld joint geometry / crack depth combinations preclude calculation of lssy for each individual case. This study addresses the accuracy with which lssy for a welded single edge notch bend, SE(B), specimen can be approximated by previously published results for homogeneous specimens. The case of a crack located on the weld joint centerline is treated. The combined effects of weld groove type, degree of mismatch, and crack depth to specimen width (all¥) ratio are considered by performing plane-strain elastic-plastic finite clement analyses ofSE(B) specimens containing a variety of common weld groove details. These results demonstrate virtually no effect of ± 20% mismatch on lssy if the distance from the crack-tip to the weld/plate interface (Lmin) exceeds 0.2-inches. If Lmin falls below 0.2-inches, there exists a deformation (applied-J) dependent value of Lmin below which reasonably accuratelssy estimation is possible. At higher levels of overmatch (500/0 to 100%), it is no longer possible to parameterize departure of1ssy for a weldment from that for a homogeneous SE(B) based on Lmin alone. Weld geon1etry significantly influences the accuracywith whichlssy for a welded SE(B) can be approximated by lssy for a homogeneous specimen at these extreme overmatch levels. ABSTRACTDodds and Anderson provide a framework to quantify finite size and crack depth effects on fracture toughness when failure occurs at deformation levels wherel no longer uniquely describes the state of stresses and strains in the vicinity of the crack-tip. Size effects on cleavage fracture are quantified by derming a value termed lssy: the 1 to which an infinite body must be loaded to achieve the same stressed volume, and thereby the same likelihood of cleavage fracture, as in a finite body. In weld metal fracture toughness testing, mismatch between weld metal and baseplate strength can alter deformation patterns, which complicates size and crack depth effects on cleavage fracture toughness. However, the virtually limitless number of weld joint geometry I crack depth combinations preclude calculation of lssy for each individual case. This study addresses the accuracy with which lssy for a welded single edge notch bend, SE(B), specimen can be approximated by prcviously published results ...

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Section: Crack-tip Stresses In Infinite Bodiesmentioning

confidence: 53%

The influence of weld strength mismatch on crack-tip constraint in single edge notch bend specimens

Kirk

Dodds

1993

Int J Fract

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Suggested toughness/temperature relations for reactor pressure vessel steels

Rosenfield

1993

Nuclear Engineering and Design

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Fracture Toughness in the Transition Region of a Carbon Steel and a Ferritic Nodular Cast Iron

Nakano

Yasunaka

1995

Tetsu-to-Hagane

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Fracture Toughness in the Transition Region of a Carbon Steel and a Ferritic Nodular Cast Iron Keishi NAKANO and Takashi YASUNAKA Synopsis : In order to characterize the fracture toughness in the ductile-brittle transition region for thick-walled cylinders of ASME SA350 Gr.LF5 carbon steel and JIS FCD300LT ferritic nodular cast iron, elastic-plastic fracture toughness tests were carried out. The specimens were fatigue precracked compact tension (CT) specimens of 25mm in thickness. The tensile testing machines used were Instron type, electrohydraulic type and drop-weight type ones.In the static fracture toughness test on a FCD300LT cast iron. CT specimens were often fractured at somewhat higher loads after the initiation of pop-in cracks. Although the scatter of pop-in fracture toughness was small, the values of critical J-integral at the unstable brittle fracture scattered largely.In the transition region of SA350 steel, the initiation of pop-in crack was not observed, and fracture toughness scattered largely.At the propagation of the unstable crack near the transition temperature, the Weibull distribution provides good fits for the critical CTOD and the critical J-integral. This distribution can be mainly interpreted by the scatter of the distance between the precrack tip and the origin of unstable brittle fracture.

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Dynamic Fracture Toughness of Modified SA508C12 in the Ductile-to-Brittle Transition Region

Cited by 3 publications

References 15 publications

The influence of weld strength mismatch on crack-tip constraint in single edge notch bend specimens

The influence of weld strength mismatch on crack-tip constraint in single edge notch bend specimens

Suggested toughness/temperature relations for reactor pressure vessel steels

Fracture Toughness in the Transition Region of a Carbon Steel and a Ferritic Nodular Cast Iron

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